我有以下代码隐藏了导航栏：
int uiOptions = (int)(Forms.Context as Activity).Window.DecorView.SystemUiVisibility;
uiOptions |= (int)SystemUiFlags.Fullscreen;
uiOptions |= (int)SystemUiFlags.HideNavigation;
uiOptions |= (int)SystemUiFlags.ImmersiveSticky;
(Forms.Context as Activity).Window.DecorView.SystemUiVisibility = (StatusBarVisibility)uiOptions;
当我有一个输入文本字段（在其中输入文本）时，导航栏将显示为备份。
当页面运气不好时，我试图隐藏它。
